KMJ carries a lot of PRO-COMP parts which are Chinese parts,the heads have been improved the valve train parts quality is not the best.Skip White posts here on the forum so you may want to look at these White Performance Detail Description as He upgrades the heads with good USA parts, read the description about the upgrades.

that actually sounds like a really good deal...but the more I think about it I just wouldn't feel right about putting chinese castings in a 63 chev, even with u.s. valvetrain parts! Just wouldn't be right....especially for a Union worker!